Gas detector



FIG. 1 is a right side elevation view of a gas detector;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a rear elevation view thereof; and,

FIG. 7 is a top view thereof.

The broken lines shown in the drawings are for illustrative purposes and form no part of the claimed design. 

What is claimed is the ornamental design for a gas detector, as shown and described. 